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Repeaters are often designed to automatically transmit the repeater's callsign, usually in Morse code. The requirements for the United States are covered in Title 47 of the Code of Federal Regulations, part 97.119. Land mobile two-way (including public safety and business mobile) require station identifications by call sign.
A copy of the code book had been captured from U-110 on 9 May 1941. A similar coding system was used for weather reports from U-boats, the Wetterkurzschlüssel, (Weather Short Code Book). A copy of this had been captured from U-559 on 29 or 30 October 1942. [160]
A code talker was a person employed by the military during wartime to use a little-known language as a means of secret communication.
Inspector Morse is a British detective drama television series based on a series of novels by Colin Dexter.It starred John Thaw as Detective Chief Inspector Morse and Kevin Whately as Sergeant Lewis.
Radio communication was by wireless telegraphy; at the sending end, an operator tapped on a switch which caused the radio transmitter to produce a series of pulses of radio waves which spelled out text messages in Morse code. At the receiver these sounded like beeps, requiring an operator who knew Morse code to translate them back to text.
Diagram of a Chappe telegraph. The regulator is segment AB. The indicators are segments AC and BD. The mast is the vertical beam. At its base is the mechanical device (the manipulator), which the operator uses to form the signal and which reproduces it in miniature (segments ac and bd).
A heliograph (from Ancient Greek ἥλιος (hḗlios) 'sun' and γράφειν (gráphein) 'to write') is a solar telegraph [1] system that signals by flashes of sunlight (generally using Morse code) reflected by a mirror. The flashes are produced by momentarily pivoting the mirror, or by interrupting the beam with a shutter. [2]
Q code and prosigns for Morse code are used in amateur radio, aviation, and marine radio. They provide specific abbreviations for concepts related to aviation, shipping, RTTY, radiotelegraph, and amateur radio. [ 40 ]